Convertible bicycle



' Patented May 23, I899. A. F. STEBNBERG.

CONVERTIBLE BICYCLE.

(A lication median. 24 1899.)

N o M u d e l I 2 s h e e t s s h e e t No. 625,612. Patented May 23, I899. A. F. STEBNBEBG. CONVERTIBLE BICYCLE. (Application filed Jan. 24, 1899.) (No Model.) {Sheets-Sheet 2.

' Flume/Mm THE Nonms PETERS co.. FHOTOLITHOW \msmnsmu, 0 cv UNITED STATES PATENT OFFICE.

ALBERT F. STERNBERG, OF CHICAGO, ILLINOIS.

CONVERTIBLE BICYCLE.

SPECIFICATION forming part of Letters Patent No. 625,612, dated May 23, 1899.

Application filed January 24,1899. Serial No. 703,282. (No model.)

' To all whom it may concern.-

Be it known that I, ALBERT F. STERNBERG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi-' I convertible bicycles, and more particularly to that class of duplex tandems which may be readily converted into a single bicycle; and the object is to provide a simple, convenient, and durable machine of this character.

To this end the invention consists in the construction, combination, and arrangement of the several parts of the device, as will be hereinaftermore fully described, and particularly pointed out in the claims.

In the accompanying drawings the same reference characters indicate the same parts of the device.

Figure 1 is a side elevation of a tandem bicycle embodying my invention. Fig. 2 is a similar view showing the sections separated. Fig. 3 shows the requisite parts assembled to form a single bicycle. Fig. 4. is an enlarged longitudinal detail section of one of the separable frame tubes or joints. Fig. 5 is a transverse section on the line 5 5 of Fig. 4.

A denotes the front steering-post tube, and B the upper and O the lower frame-tube.

B denotes the middle section of the upper frame -tube and B the rear section of the same, and which forms a continuation of the rear seat-post tube. C denotes the middle section of the lower frame-tube and C the rear section of the same. The meeting ends of these upper and lower frame-tubes are connected by the separable joints 1 2 3 4,.and as all of these joints are identical in construction I have illustrated one of them in detail in Fig. 2, and I will now proceed to describe that one, which will answer for the rest.

Referring to Fig. B denotes the upper frame-tube, the end of which carriesa brazed collar 1), which extends beyond the end of the tube B to snugly encompass the meeting end of the tube-section B, and inside of the tube B is brazed a core-tube b, and it extends a sufficient distance in said tube-section B to form a rigid lateral joint. A solid core b is fixed in the outer end of the coretube 19 to receive the set-screw D, the shank of which extends through the alined threaded orifices in the lower half of the tube-section B, the core-tube b, and the solid core 19 and the end of the screw terminates in a threadless pin (1, which extends through corresponding alined orifices in the upper half of the coretube b and section-tube B. A radial collar (1 is brazed on the outside of the tube B concentric with the set-screw, and it forms'a bearingfor the jam-nut 01 to lock the setscrew in place. A joint thus formed unites the tubes B and B as rigidly as if they were a continuous tube and with the advantage of being readily separated by simply removing the screw, and by reference to Fig. 2 it will be seen that it is only necessary to separate these four joints, remove the middle section, and connect the tubes B and O to B and O to convert the tandem shown in Fig. 1 into the single shown in Fig. 3.

The accompanying drawings show my in vention in the best form now known to me; but obviouschanges in the details may be made without departing from the spirit of my invention. i

Having thus fully described my invention, what I claim as new and useful, and desire to secure by Letters Patent of the United States,

1. In a convertible or separable frame bi cycle, a tube-joint, comprising the frame-tube, B, the collar, 19, and the core-tube, b, rigidly fixed thereto and projecting beyond the end thereof, in combination with the tube-section, the meeting end of which is adapted to be inserted in said collar and encompass said coretube, and the set-screw to extend radially through said tube, B, and core-tube, 1), substantially as shown and described.

2. In a separable-frame bicycle, a tube-j oint ALBERT F. STERNBERG.

Witnesses:

WILLIAM HAMILTON, JOHN MURDOOH. 

